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Proceedings Paper

Phase-dependent gain without inversion in an inhomogeneous broadened quasi Λ-type four-level system with VIC
Author(s): Zhongbo Liu; Zhendong Wang; Kening Jia; Dianmin Tong; Xijun Fan
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Paper Abstract

The effect of the relative phase (φ) between the probe and driving fields on the gain without inversion (GWI) is studied in a Doppler broadened quasi Λ-type four-level atomic system with vacuum induced coherence (VIC). It is shown that: The probe detuning region in which GWI exists and size of GWI are very sensitive to variation of the relative phase, the Doppler width ( D ) also has dramatically modulation role on the phase-dependent GWI. The GWI maximum value ( Gmax ) varies periodically with the relative phase varying, the period is 2π; but the concrete varying rule is closely related to the value of the Doppler width. In the case of D = 0 (i.e. without Doppler broadening) , when 0 < φ < π, Gmax increases monotonously with φ increasing; when π <φ < 2π, Gmax decreases monotonously with φ increasing; when φ =π, Gmaxhas the largest value. Under the condition of D ≠ 0 (i.e. Doppler broadening presents), in both regions 0 < φ < π and π < φ < 2π, Gmax does not monotonically increase or decrease with φ increasing; the value of φ, which corresponds to the largest value of Gmax, decreases gradually from π with D increasing, when value of D is large enough, the value of φ, which corresponds to the largest value of Gmax, is about π/2. In general speaking, Gmax decreases with D increasing; but Gmax larger than that in the corresponding static atomic system ( D = 0 ) can be gotten by choosing suitable values of φ and D.

Paper Details

Date Published: 5 November 2010
PDF: 8 pages
Proc. SPIE 7846, Quantum and Nonlinear Optics, 78460Q (5 November 2010); doi: 10.1117/12.868434
Show Author Affiliations
Zhongbo Liu, Shandong Normal Univ. (China)
Zhendong Wang, Shandong Normal Univ. (China)
Kening Jia, Shandong Normal Univ. (China)
Dianmin Tong, Shandong Univ. (China)
Xijun Fan, Shandong Normal Univ. (China)


Published in SPIE Proceedings Vol. 7846:
Quantum and Nonlinear Optics
Qihuang Gong; Guang-Can Guo; Yuen-Ron Shen, Editor(s)

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